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Thanks Bernard, i was wondering why that wasn't the case. If they had been then i'm sure that this port wouldn't have leaked even with the top pin released.

Thanks Kev, and i'll have a look for that valve.

I was wakened in the early hours by the large upstairs hallway radiator making sloshing/gurgling sound. Being half asleep i just turned it off thinking air etc, but it kept on gurgling so i headed downstairs to the understairs cupboard where the heating manifold and pump are located and...